Stability analysis of the reservoir bank landslide with weak interlayer considering the influence of multiple factors
Wengang Zhang, Xuanyu Meng, Luqi Wang, Fansheng Meng
Abstract
There are many factors that induce landslides on the reservoir banks, including periodically changing reservoir water level, rainfall and micro-seismic in the reservoir area. To study the evolution process of the reservoir bank landslide with a weak interlayer under the combined action of multiple factors, this article adopts a combination of field investigation, indoor tests and numerical simulation to analyze the Zhaoshuling landslide in the Three Gorges Reservoir Area. The fluctuations of the reservoir water level and real-time rainfall are used to establish the seepage field of the landslide, and earthquakes are introduced to investigate the instability of landslides. Furthermore, the indoor tests are used to determine the parameters of the rock with different numbers of dry-wet cycles, then the evolution trend of the landslide can be analyzed. The results indicate that the stability of landslides is lowest in June during a typical hydrological year. Moreover, the landslide would be in a critical state under the 0.05 g seismic peak acceleration. Due to the changing reservoir water level, the strength reduction of weak interlayers would accelerate the instability of the Zhaoshuling landslide. This study could provide guidance for the prevention and mitigation of the reservoir bank.